(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

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4. I/O device decodes the
descriptor and accesses the payload, performing the operations described in the
descriptor.

5. I/O device signals
completion.

High speed I/O device
interfaces, such as networking and storage I/O, conventionally operate on the
following basic principles:

• Descriptors that are written
once are never accessed again until after the I/O device has finished
processing them.

• Payload buffers
embedded in descriptors are not touched until after the I/O device has finished
processing the corresponding descriptor.

• Payload buffers
created by applications are allocated from write-back memory.

A single queue
architecture can result in head-of-line blocking issues that reduce
performance.

Description

The disclosed method is a split queue to improve transmit
latency. The method creates separate inbound and outbound queues that reside
in different physical domains, system memory, and device memory (see Figure 1).

The interactions
between system software running on the CPU and the I/O device are modified as
follows (see Figure 2):...